AEKIV FÖR ZOOLOGI. 



BAND 7. N:o 26. 



Crnstacea collected by tlie Swedisli Zoological 

 Expedition to Britisli East Africa 1911. 



By 



EINAR LÖNNBERG, and G. BUDDE-LUND. 



With 6 figures in the text. 



Communicated 6*^ Dec. 1911. 



Decapoda. 

 Potamoii (Potamonautes) johustoni Miers. 



Calman: Träns. Zool. Soc. London Vol. XIX Part 1 p. 51. 



Freshwater crabs were collected in Itiolu and Lekiundu 

 rivers, tributaries to Guaso Nyiri from the southern side, 

 at severai opportunities, and in different sizes and ages. 



The 2 Vi 1^11 I found a small crab under a log in the 

 forest above Meru boma rather far from, and high above the 

 nearest rivulet. I was glad över this discovery, but after 

 having examined all my specimens my friend Dr. Th. La- 

 gerberg has stated that they all belong to the same species 

 as mentioned above. 



One of the largest of my specimens is according to Dr. 

 Lagerberg very similar to the type of this species from 

 Kilimanjaro as figured by Calman (1. c. p. 54). The changes 

 in general shape of this species are very ramarkable. 



From a zoogeographical point of view it is of interest 

 to find that this species occurs not only in the forests at 

 higher altitudes but also in the small rivers of the acaoia- 

 steppe. 



Arkiv för zoologi. Band 7. X:o 26. 1 



